package com.liuxy.androidutil;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;

public class ListViewUtils {
	private static final String TAG = "MyTools.ListViewUtils";
	
    public static void setListViewHeightBasedOnChildren(ListView listView) {  
        ListAdapter listAdapter = listView.getAdapter();   
        if (listAdapter == null) {  
            // pre-condition  
            return;  
        }  
  
        int totalHeight = 0;  
        for (int i = 0; i < listAdapter.getCount(); i++) {  
            View listItem = listAdapter.getView(i, null, listView);  
            listItem.measure(0, 0);  
            totalHeight += listItem.getMeasuredHeight();  
        }  
  
        ViewGroup.LayoutParams params = listView.getLayoutParams();  
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1))+listView.getPaddingBottom()+listView.getPaddingTop();  
        listView.setLayoutParams(params);  
    }
    
    private ListViewUtils(){
		/* cannot be instantiated */
		throw new UnsupportedOperationException(TAG+" cannot be instantiated");
	}
} 